Siemens SIMATIC S5 Interface Module 6ES5312-5CA12

Description

The 6ES5312-5CA12, also known as the IM 312, is a crucial interface module for the Siemens SIMATIC S5 automation platform. It facilitates the connection between a central controller (CC) of an S5-135U or S5-155U system and an expansion unit (EU), enabling the expansion of the system's I/O capabilities over a distance. This module is essential for maintaining and repairing legacy systems that rely on the robust and widely deployed S5 architecture.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC S5
• Part Number: 6ES5312-5CA12
• Module Type: Interface Module IM 312
• Application: Connection of S5-135U/155U Central Controller to Expansion Units
• Version (E-Stand): 01

Label Info

• Board Designation: PC 612 F B1100-F425 WK
• Board Order Number: C79458-L820-B17

Application

Used in manufacturing, process control, and industrial automation systems from the 1980s and 1990s. Critical for extending the I/O of S5-135U and S5-155U PLCs to additional racks.

Country of Origin

Germany

CO2 Impact

By choosing this pre-owned module over a new one, you contribute to significant CO2 savings. This single component represents an avoided emission of approximately 20.0 kg, which is comparable to the emissions from a car driving 100 kilometers. Opting for circular economy solutions is a smart choice for both your budget and the planet.

Availability

This product is an obsolete but essential spare part. Availability is limited. Order now from PLC2Day for expert support and fast delivery.

FAQ

Question? What is the maximum distance between the central controller and the expansion unit when using the IM 312?

The IM 312 (6ES5312-5CA12) uses a specific interface cable, and the maximum transmission distance is typically limited to 3 meters.

No, the IM 312 is specifically designed for use with the S5-135U and S5-155U high-performance PLCs. It is not compatible with smaller systems like the S5-95U or S5-115U.

The module itself does not require programming, but the PLC's hardware configuration must be correctly set up in the STEP 5 software to recognize the expansion rack and its associated I/O modules connected via the IM 312.

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Last Update: March 13, 2026